Awliya Wedad Y, Al-Alwani Deemah J, Gashmer Eftekar S, Al-Mandil Huda B
Department of Restorative Dental Sciences, College of Dentistry, King Saud University, P.O. Box 5967, Riyadh 11432, Saudi Arabia.
Saudi Dent J. 2010 Oct;22(4):177-81. doi: 10.1016/j.sdentj.2010.07.008. Epub 2010 Jul 17.
This study assessed the influence of commonly used types of coffee, in Saudi Arabia, on surface microhardness and color stability of microhybrid resin-based composite (Filtek Z250), nanofilled resin-based composite (Filtek Supreme) and organic modified ceramic composite (Ormocer).
A total of 75 disk-shaped specimens were fabricated (25 discs from each type of material). After initial color and microhardness recording, samples were randomly divided into five groups (n = 5). Four groups of specimens from each material were immersed in 1 of 4 types of coffee (American, Arabic, Turkish and Espresso coffee) and the fifth group was stored in saline to serve as control. The specimens were immersed in the different types of coffee for 3 weeks. At the end of the test period, surface microhardness and color were measured again.
It was observed that there is no significant difference in microhardness of the three tested materials after immersion in the different types of coffee. However, all resin-based materials showed significant color change when compared to control (saline). Filtek Z250 showed the least color change among the three materials followed by Ormocer. On the other hand, Filtek Supreme was the most common material prone to discoloration. Espresso coffee caused the most change in color followed by Turkish then American coffee. Nevertheless, Arabic coffee caused the least color change of the three materials.
Color stability of resin-based materials is affected by their different material composition.
本研究评估了沙特阿拉伯常用的几种咖啡对微混合树脂基复合材料（Filtek Z250）、纳米填充树脂基复合材料（Filtek Supreme）和有机改性陶瓷复合材料（Ormocer）表面显微硬度和颜色稳定性的影响。
共制作75个圆盘形试件（每种材料制作25个圆盘）。在记录初始颜色和显微硬度后，将样本随机分为五组（n = 5）。每种材料的四组试件分别浸泡在四种咖啡（美式咖啡、阿拉伯咖啡、土耳其咖啡和意式浓缩咖啡）中的一种中，第五组保存在盐水中作为对照。将试件浸泡在不同类型的咖啡中3周。在试验期结束时，再次测量表面显微硬度和颜色。
观察发现，三种受试材料浸泡在不同类型的咖啡后，显微硬度没有显著差异。然而，与对照组（盐水）相比，所有树脂基材料都出现了显著的颜色变化。Filtek Z250在三种材料中颜色变化最小，其次是Ormocer。另一方面，Filtek Supreme是最容易变色的材料。意式浓缩咖啡导致的颜色变化最大，其次是土耳其咖啡，然后是美式咖啡。然而，阿拉伯咖啡导致的三种材料颜色变化最小。
树脂基材料的颜色稳定性受其不同材料组成的影响。
